<template>
    <!-- 面包屑导航 -->
    <el-breadcrumb separator=">">
    <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
    <el-breadcrumb-item>商品管理</el-breadcrumb-item>
    <el-breadcrumb-item>商品列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图 -->
    <el-card>
        <!-- 提示区域 -->
        <el-alert title="添加商品区域" type="info" center show-icon :closable="false"/>
        
        <!-- 步骤条 -->
        <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
            <el-step title="基本信息" />
            <el-step title="商品参数" />
            <el-step title="商品属性" />
            <el-step title="商品图片" />
            <el-step title="商品内容" />
            <el-step title="完成" />
        </el-steps>

        <!-- tab栏区域 -->
        <el-form
            ref="addFormRef"
            :model="addForm"
            :rules="addFormRules"
            label-width="100px"
            label-position="top"
        >
            <el-tabs
                v-model="activeIndex"
                tab-position="left"
                :before-leave="beforeTabLeave"
                @tab-change="tabClicked"
            >
                <el-tab-pane label="基本信息" name="0">
                    <el-form-item label="商品名称" prop="goods_name">
                        <el-input v-model="addForm.goods_name"></el-input>
                    </el-form-item>
                    <el-form-item label="商品价格" prop="goods_price">
                        <el-input v-model="addForm.goods_price" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品重量" prop="goods_weight">
                        <el-input v-model="addForm.goods_weight" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品数量" prop="goods_number">
                        <el-input v-model="addForm.goods_number" type="number"></el-input>
                    </el-form-item>
                    <el-form-item label="商品分类" prop="goods_cat">
                        <el-cascader style="margin-left:15px" v-model="addForm.goods_cat" 
                        :options="catelist" :props="cascaderProps" clearable
                        @change="handleChange" 
                        />
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品参数" name="1">
                    <!-- 渲染表单的item项 -->
                    <el-form-item :label="item.attr_name"
                    v-for="item in manyTableData" :key="item.attr_id"
                    >
                        <!-- 复选框组 -->
                        <el-checkbox-group v-model="item.attr_vals">
                        <el-checkbox :label="cb" 
                        v-for="(cb, i) in item.attr_vals"
                        :key="i"
                        border
                        />
                        </el-checkbox-group>
                    </el-form-item>
                </el-tab-pane>
                <el-tab-pane label="商品属性" name="2">
                    <el-form-item :label="item.attr_name"
                    v-for="item in onlyTableData" :key="item.attr_id"
                    >
                    <el-input v-model="item.attr_vals"></el-input>
                    </el-form-item>

                </el-tab-pane>
                <el-tab-pane label="商品图片" name="3">
                    <!-- action 图片上传后的地址 -->
                    <el-upload
                        :action="uploadURL"
                        :on-preview="handlePreview"
                        :on-remove="handleRemove"
                        list-type="picture"
                        :headers="headerObj"
                        :on-success="handleSuccess"
                    >
                        <el-button type="primary">点击上传</el-button>
                    </el-upload>
                </el-tab-pane>
                <el-tab-pane label="商品内容" name="4">
                    <!-- <QuillEditor v-model="addForm.goods_introduce"></QuillEditor> -->
                    <el-input></el-input>
                    <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                </el-tab-pane>
            </el-tabs>
        </el-form>

   </el-card>

   <!-- 图片预览 -->
   <el-dialog
    v-model="previewVisible"
    title="图片预览"
    width="50%"
    >
        <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
</template>

<script>
import _ from 'lodash'
export default {
    data() {
        return {
            activeIndex: '0',
            addForm: {
                goods_name: '',
                goods_price: 0,
                goods_weight: 0,
                goods_number: 0,
                // 商品所属的分类数组
                goods_cat: [],
                // 图片的数组
                pics: [],
                attrs: []
            },
            addFormRules: {
                goods_name: [{required: true, message: '请输入商品名称', trigger: 'blur'}],
                goods_price: [{required: true, message: '请输入商品价格', trigger: 'blur'}],
                goods_weight: [{required: true, message: '请输入商品重量', trigger: 'blur'}],
                goods_number: [{required: true, message: '请输入商品数量', trigger: 'blur'}],
                goods_cat: [{required: true, message: '请选择商品分类', trigger: 'blur'}]
            },

            catelist: [],
            cascaderProps: {
                label: 'cat_name',
                value: 'cat_id',
                children: 'children',
                expandTrigger: 'hover',
                checkStrictly: true,
            },

            // 动态参数列表数据
            manyTableData: [],
            onlyTableData: [],
            uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
            headerObj: {
                Authorization:window.sessionStorage.getItem('token')
            },
            previewPath: '',
            previewVisible: false,
            // 商品的详情
            goods_introduce: ''
        }
    },
    created() {
        this.getCateList()
    },
    methods: {
        // 获取所有商品分类数据
        async getCateList() {
            const {data: res} = await this.$http.get('categories')
                if (res.meta.status !== 200) {
                return this.$message.error('获取商品分类数据失败')
            }

            this.catelist = res.data
        },

        // 级联选择器变化触发此函数
        handleChange() {
            if (this.addForm.goods_cat.length !== 3) {
                this.addForm.goods_cat = []
                return
            }
            
        },

        beforeTabLeave(activeName, oldActiveName) {
            if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
                this.$message.error('请先选择商品分类')
                return false
            }
        },

        async tabClicked() {
            if (this.activeIndex === '1') {
                const { data: res } = await this.$http.get(
                    `categories/${this.cateId}/attributes`,
                    { params: { sel: 'many' } }
                )

                
                if (res.meta.status !== 200) {
                    return this.$message.error('获取动态参数列表失败')
                }
                
                res.data.forEach(item => {
                    item.attr_vals = item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
                })
                this.manyTableData = res.data
            } else if (this.activeIndex === '2') {
                const { data: res } = await this.$http.get(
                    `categories/${this.cateId}/attributes`,
                    { params: { sel: 'only' } }
                )

                if (res.meta.status !== 200) {
                    return this.$message.error('获取静态属性失败')
                }
                this.onlyTableData = res.data
                console.log(res.data)
            }
        },

        // 处理图片预览效果
        handlePreview(file) {
            this.previewPath = file.response.data.url
            this.previewVisible = true
        },

        // 处理移除图片操作
        handleRemove(file) {
            const filePath = file.response.data.tmp_path
            const i = this.addForm.pics.findIndex(x => x.pic === filePath)
            this.addForm.pics.splice(i, 1)
            console.log(this.addForm)
        },

        // 监听图片上传成功事件
        handleSuccess(response) {
            console.log(response)
            const picInfo = { pic: response.data.tmp_path }
            console.log(picInfo)
            this.addForm.pics.push(picInfo) 
            console.log(this.addForm)
        },

        // 添加商品
        add() {
            this.$refs.addFormRef.validate(
                async valid => {
                    if (!valid) {
                        return this.$message.error('请填写必要表单项目')
                    }

                    // lodash cloneDeep(obj)深拷贝
                    const form = _.cloneDeep(this.addForm)
                    form.goods_cat = form.goods_cat.join(',')
                    // 处理动态参数
                    this.manyTableData.forEach(item => {
                        const newInfo = {
                            attr_id: item.attr_id,
                            attr_value: item.attr_vals.join(' ')
                        }
                        this.addForm.attrs.push(newInfo)
                    })
                    // 处理静态属性
                    this.onlyTableData.forEach(item => {
                        const newInfo = {
                            attr_id: item.attr_id,
                            attr_value: item.attr_vals
                        }
                        this.addForm.attrs.push(newInfo)
                    })            
                        form.attrs = this.addForm.attrs
                    console.log(form)
                    // 发起请求添加商品
                    // 商品名称必须唯一
                    const { data : res} = await this.$http.post('goods',form)
                    if (res.meta.status != 201) {
                        return this.$message.error('添加商品失败')
                    }

                    this.$message.success('添加商品成功')
                    this.$router.push('/goods')
                })
        }
    },

    computed: {
        cateId() {
            if (this.addForm.goods_cat.length === 3) {
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }
}
</script>

<style>
.el-checkbox{
    margin: 5px 5px 0 0 !important;
}

.previewImg{
    width: 100%;
}

.btnAdd{
    margin-top: 15px;
}
</style>